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Biomass-based functional group modified sodium ion battery anode material, preparation method and application thereof

A sodium-ion battery and biomass material technology, applied in the direction of active material electrodes, battery electrodes, carbon preparation/purification, etc., can solve the problems of battery short circuit, high reactivity, low specific capacity, etc., and achieve rate performance improvement. capacity, easy access

Pending Publication Date: 2020-02-04
LIAONING STARRY SKY SODIUM BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sodium-ion batteries and lithium-ion batteries have similar working principles, but if metal sodium is directly used as the negative electrode of the sodium-ion battery, dendrites will be generated when the battery is working, which will cause safety problems such as battery short circuit
At the same time, due to the high reactivity of metallic sodium in many organic electrolytes and the instability of the passivation layer, very few negative electrode materials are suitable for the deintercalation of sodium ions, so how to find electrodes with large sodium storage capacity and high structural stability Materials are the key now
[0003] As a very common electrode material, graphite has been widely used in lithium-ion batteries, but for sodium-ion batteries, due to the thermodynamic and kinetic problems of sodium itself, it can only show a very low specific capacity.

Method used

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  • Biomass-based functional group modified sodium ion battery anode material, preparation method and application thereof
  • Biomass-based functional group modified sodium ion battery anode material, preparation method and application thereof
  • Biomass-based functional group modified sodium ion battery anode material, preparation method and application thereof

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Embodiment 1

[0057] This embodiment relates to a preparation method of a functional group modified biomass-based sodium ion battery negative electrode material, comprising the following steps:

[0058] 1) 1000 g of corn cobs were used as raw material, washed three times with deionized water, and then dried in a muffle furnace at 100° C. for 5 hours.

[0059] 2) The carbon precursor was obtained after heating corn cobs at 800° C. for 4 hours under a carbon monoxide atmosphere.

[0060] 3) The obtained carbon precursor is pulverized with a ball mill until the D50 reaches 10 microns, and the particle size distribution is narrow.

[0061] 4) The pulverized carbon precursor was immersed in a 0.1 mol / L concentrated phosphoric acid solution and stirred for 1 hour, and then the carbon precursor was taken out.

[0062] 5) Washing the treated carbon precursor with water until neutral.

[0063] 6) The treated carbon precursor was dried in a muffle furnace at 110° C. for 6 hours and then passed thro...

Embodiment 2

[0069] This embodiment relates to a preparation method of a functional group modified biomass-based sodium ion battery negative electrode material, comprising the following steps:

[0070] 1) Take 200 g of pumpkin vines as raw material, wash with distilled water three times, and dry in a blast oven at 130° C. for 5 hours.

[0071] 2) The carbon precursor was obtained by heating corn stover at 600°C for 10 hours under an argon atmosphere.

[0072] 3) The obtained carbon precursor is pulverized using a jet mill until the D50 reaches 20 microns, and the particle size distribution is narrow.

[0073] 4) The pulverized carbon precursor was immersed in a 1 mol / L sodium hypochlorite solution and stirred for 1 hour, and then the carbon precursor was taken out.

[0074] 5) Wash the treated carbon precursor with 0.01mol / L dilute hydrochloric acid for 3 times, and then wash with water until neutral.

[0075] 6) Dry the treated carbon precursor at 200° C. for 5 hours and pass through a ...

Embodiment 3

[0081] This embodiment relates to a preparation method of a functional group modified biomass-based sodium ion battery negative electrode material, comprising the following steps:

[0082] 1) 1000 g of rice straw was used as a raw material, washed three times with distilled water, and then dried in a tube furnace at 201° C. for 48 hours.

[0083] 2) The carbon precursor was obtained by heating rice straw at 300°C for 24 hours under a nitrogen atmosphere.

[0084] 3) The obtained carbon precursor is crushed with a jaw crusher until the D50 reaches 50 microns, and the particle size distribution is narrow.

[0085] 4) The pulverized carbon precursor was immersed in 0.5 mol / L potassium dichromate and stirred for 1 hour, and then the carbon precursor was taken out.

[0086] 5) Wash the treated carbon precursor with 0.01mol / L dilute hydrochloric acid for 3 times, and then wash with water until neutral.

[0087] 6) Dry the treated carbon precursor at 200° C. for 5 hours and pass th...

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Abstract

The invention provides a biomass-based functional group modified sodium ion battery anode material and a preparation method and application thereof. The method includes washing and drying a biomass material, sintering the biomass material at 100 to 800 DEG C for 1 to 48 hours under an inert atmosphere, cooling to room temperature and crushing the biomass material to obtain a carbon precursor witha certain particle size; soaking the carbon precursor in a treatment solution for 0.5 to 72 hours to remove impurities, increase functional groups on the surface of a carbon material, and adjust the pore distribution; washing and drying the treated carbon precursor, sieving, performing secondary sintering, and maintaining the temperature at 800 to 2,500 DEG C for 0.5 to 48 hours under an inert atmosphere to obtain the final product. The operation process is simple and easy. The biomass-based porous carbon material has low price, high energy density, and good rate performance, and has a good application prospect in the field of sodium ion battery anode materials.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for sodium ion batteries, and relates to a negative electrode material for sodium ion batteries modified by functional groups based on biomass, a preparation method and application thereof. Background technique [0002] As an important electrochemical energy storage device, lithium-ion batteries have been mass-produced and widely used in digital products, electric vehicles and smart grids due to their high energy density, long cycle life and no memory effect. . However, with the emergence of various new electronic devices, the vigorous development of new energy vehicles and the continuous increase in market demand, lithium resources required for lithium-ion batteries are in serious shortage, which brings high battery costs. To a large extent, it restricts the large-scale production and use of lithium-ion batteries. Therefore, finding new energy storage devices to replace lithium-ion b...

Claims

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Application Information

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IPC IPC(8): C01B32/05H01M4/587H01M10/054H01M4/02
CPCC01B32/05H01M4/587H01M10/054H01M2004/027H01M2004/021Y02E60/10
Inventor 侴术雷张睿琦李春生李用成曹余良李东祥李亚书
Owner LIAONING STARRY SKY SODIUM BATTERY CO LTD